I made the angles per drawing. There are three of them, short, medium and long. I drilled the holes in one end per drawing dimensions. I was puzzled as to where the short angle locates laterial on the plate and also the medium angle didn't seem to have a specific laterial location on its rib. But then I discovered that the two holes I had drilled per drawing dimensions aligned with each other and with the corner clecoed their laterial positions on the plate and rib were defined.
